Brachiaria seeds germination under different concentration of gibberellin

Dormancy in tropical grasses is associated with physiological or physical causes present in freshly harvested seeds. The aim of this study was to evaluate the effect of different concentrations of GA(3) in the percentage of germination and suppuration of dormancy of Brachiaria brizantha. Seeds of B. brizantha 'Marandu' and 'MG5' were immersed in different concentrations of GA(3) (0, 25, 50, 75 and 100 mg. L-1) for 2h. After this process, the germination and viability of seed were determinated. The design was completely randomized consisting of 5 treatments with 4 replications for both cultivars. Germination was affected by different concentrations of gibberellins and best results were obtained with the use of 62 and 57 mg. L-1 GA(3) for 'Marandu' and 'MG 5', respectively.